Types of valves : What is spool valve, check valve & solenoid valve ?

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Types of valves : What is spool valve, check valve & solenoid valve ?

which one restricts the flow of liquid in one direction & maintains the required pressure ??

ThanXxxX
 

A check valve restricts the flow direction. A spool valve, is a single input , two output device, Imagine a tube with an input in the centre and two outputs at each end. The "Spool" can move up and down so as to direct the centre flow out at either end (one at a time). A solenoid valve is just a valve that is operated by an electric current. To maintain the pressure, err, you need a pressure release valve that bleeds any excessive pressure away to the sump.
frank
 

Spool valve
A valve that controls the direction of hydraulic fluid or air flow.
A spool valve consists of cylindrical spools that alternately block and open channels in the system.



Check valve
A check valve, clack valve, non-return valve or one-way valve is a mechanical device, a valve, which normally allows fluid
(liquid or gas) to flow through it in only one direction.



A solenoid valve is an electromechanical valve for use with liquid or gas.
The valve is controlled by an electric current through a solenoid.

 
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    munzir

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so this means its a check valve
 

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